Skinner, Luke C. and Waelbroeck, Claire and Scrivner, Adam E. and Fallon, Stewart J. (2014) Radiocarbon evidence for alternating northern and southern sources of ventilation of the deep Atlantic carbon pool during the last deglaciation. Proceedings of the National Academy of Sciences, 111 (15). pp. 5480-5484. ISSN 0027-8424, 1091-6490 DOI https://doi.org/10.1073/pnas.1400668111
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Abstract
Recent theories for glacial–interglacial climate transitions call on millennial climate perturbations that purged the deep sea of sequestered carbon dioxide via a “bipolar ventilation seesaw.” However, the viability of this hypothesis has been contested, and robust evidence in its support is lacking. Here we present a record of North Atlantic deep-water radiocarbon ventilation, which we compare with similar data from the Southern Ocean. A striking coherence in ventilation changes is found, with extremely high ventilation ages prevailing across the deep Atlantic during the last glacial period. The data also reveal two reversals in the ventilation gradient between the deep North Atlantic and Southern Ocean during Heinrich Stadial 1 and the Younger Dryas. These coincided with periods of sustained atmospheric CO2 rise and appear to have been driven by enhanced ocean–atmosphere exchange, primarily in the Southern Ocean. These results confirm the operation of a bipolar ventilation seesaw during deglaciation and underline the contribution of abrupt regional climate anomalies to longer-term global climate transitions.
Item Type: | Article |
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Additional Information: | Copyright © 2014 National Academy of Sciences This paper is made available according to the conditions stated here: http://www.sherpa.ac.uk/romeo/issn/1091-6490/ |
Uncontrolled Keywords: | 2014AREP; IA67; |
Subjects: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
Divisions: | 01 - Climate Change and Earth-Ocean Atmosphere Systems 08 - Green Open Access |
Journal or Publication Title: | Proceedings of the National Academy of Sciences |
Volume: | 111 |
Page Range: | pp. 5480-5484 |
Identification Number: | https://doi.org/10.1073/pnas.1400668111 |
Depositing User: | Sarah Humbert |
Date Deposited: | 05 May 2014 15:30 |
Last Modified: | 13 Jul 2014 17:20 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/3046 |
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